They come in lots of styles; knitted, lightweight, even patterned. They're great if you don't have time to faff around with a scarf, as you just pull it over and ta-da! Bright colours work really well.

You can even use a dress/top with a gathered collar (like my orange dress in the Colour Crush section) to make a fake-snood if you find them too thick. You cannot deny how warm you'll be though!